1 // license:BSD-3-Clause
2 // copyright-holders:Olivier Galibert, Nathan Gilbert
3
4 // Xavix2 disassembler
5
6 #include "emu.h"
7 #include "xavix2d.h"
8
opcode_alignment() const9 u32 xavix2_disassembler::opcode_alignment() const
10 {
11 return 1;
12 }
13
14 const u8 xavix2_disassembler::bpo[8] = { 4, 3, 3, 2, 2, 2, 2, 1 };
15
16 const char *const xavix2_disassembler::reg_names[8] = { "r0", "r1", "r2", "r3", "r4", "r5", "sp", "lnk" };
17
r1()18 const char *xavix2_disassembler::r1()
19 {
20 return reg_names[(m_opcode >> 22) & 7];
21 }
22
r2()23 const char *xavix2_disassembler::r2()
24 {
25 return reg_names[(m_opcode >> 19) & 7];
26 }
27
r3()28 const char *xavix2_disassembler::r3()
29 {
30 return reg_names[(m_opcode >> 16) & 7];
31 }
32
val22h()33 std::string xavix2_disassembler::val22h()
34 {
35 return util::string_format("%08x", u32(m_opcode << 10));
36 }
37
val22s()38 std::string xavix2_disassembler::val22s()
39 {
40 u32 r = m_opcode & 0x3fffff;
41 if(m_opcode & 0x200000)
42 return util::string_format("-%06x", 0x400000 - r);
43 else
44 return util::string_format("%06x", r);
45 }
46
val19s()47 std::string xavix2_disassembler::val19s()
48 {
49 u32 r = m_opcode & 0x7ffff;
50 if(m_opcode & 0x40000)
51 return util::string_format("-%06x", 0x80000 - r);
52 else
53 return util::string_format("%06x", r);
54 }
55
val19u()56 std::string xavix2_disassembler::val19u()
57 {
58 return util::string_format("%05x", m_opcode & 0x7ffff);
59 }
60
val14h()61 std::string xavix2_disassembler::val14h()
62 {
63 return util::string_format("%08x", ((m_opcode >> 8) & 0x3fff) << 18);
64 }
65
val14u()66 std::string xavix2_disassembler::val14u()
67 {
68 return util::string_format("%04x", (m_opcode >> 8) & 0x3fff);
69 }
70
val14s()71 std::string xavix2_disassembler::val14s()
72 {
73 u16 r = (m_opcode >> 8) & 0x3fff;
74 if(r & 0x2000)
75 return util::string_format("-%04x", 0x4000 - r);
76 else
77 return util::string_format("%04x", r);
78 }
79
val14sa()80 std::string xavix2_disassembler::val14sa()
81 {
82 u16 r = (m_opcode >> 8) & 0x3fff;
83 if(r & 0x2000)
84 return util::string_format("%08x", r - 0x4000);
85 else
86 return util::string_format("%04x", r);
87 }
88
val11s()89 std::string xavix2_disassembler::val11s()
90 {
91 u16 r = (m_opcode >> 8) & 0x7ff;
92 if(r & 0x400)
93 return util::string_format("-%03x", 0x800 - r);
94 else
95 return util::string_format("%03x", r);
96 }
97
val11u()98 std::string xavix2_disassembler::val11u()
99 {
100 return util::string_format("%03x", (m_opcode >> 8) & 0x7ff);
101 }
102
val6u()103 std::string xavix2_disassembler::val6u()
104 {
105 return util::string_format("%02x", (m_opcode >> 16) & 0x3f);
106 }
107
val6s()108 std::string xavix2_disassembler::val6s()
109 {
110 u16 r = (m_opcode >> 16) & 0x3f;
111 if(r & 0x20)
112 return util::string_format("-%02x", 0x40 - r);
113 else
114 return util::string_format("%02x", r);
115 }
116
val3u()117 std::string xavix2_disassembler::val3u()
118 {
119 return util::string_format("%x", (m_opcode >> 16) & 0x7);
120 }
121
off19s()122 std::string xavix2_disassembler::off19s()
123 {
124 u16 r = m_opcode & 0x7ffff;
125 if(r & 0x40000)
126 return util::string_format(" - %05x", 0x80000 - r);
127 else if(r)
128 return util::string_format(" + %05x", r);
129 else
130 return "";
131 }
132
off14s()133 std::string xavix2_disassembler::off14s()
134 {
135 u16 r = (m_opcode >> 8) & 0x3fff;
136 if(r & 0x2000)
137 return util::string_format(" - %04x", 0x4000 - r);
138 else if(r)
139 return util::string_format(" + %04x", r);
140 else
141 return "";
142 }
143
off11s()144 std::string xavix2_disassembler::off11s()
145 {
146 u16 r = (m_opcode >> 8) & 0x7ff;
147 if(r & 0x400)
148 return util::string_format(" - %03x", 0x800 - r);
149 else if(r)
150 return util::string_format(" + %03x", r);
151 else
152 return "";
153 }
154
off6s()155 std::string xavix2_disassembler::off6s()
156 {
157 u16 r = (m_opcode >> 16) & 0x3f;
158 if(r & 0x20)
159 return util::string_format(" - %02x", 0x40 - r);
160 else if(r)
161 return util::string_format(" + %02x", r);
162 else
163 return "";
164 }
165
off3s()166 std::string xavix2_disassembler::off3s()
167 {
168 u16 r = (m_opcode >> 16) & 0x7;
169 if(r & 0x4)
170 return util::string_format(" - %x", 8 - r);
171 else if(r)
172 return util::string_format(" + %x", r);
173 else
174 return "";
175 }
176
adr24()177 std::string xavix2_disassembler::adr24()
178 {
179 return util::string_format("%06x", m_opcode & 0xffffff);
180 }
181
adr16()182 std::string xavix2_disassembler::adr16()
183 {
184 return util::string_format("%06x", (m_pc & 0xffff0000) | ((m_opcode >> 8) & 0xffff));
185 }
186
rel16()187 std::string xavix2_disassembler::rel16()
188 {
189 return util::string_format("%06x", m_pc + static_cast<s16>(m_opcode >> 8));
190 }
191
rel8()192 std::string xavix2_disassembler::rel8()
193 {
194 return util::string_format("%06x", m_pc + static_cast<s8>(m_opcode >> 16));
195 }
196
disassemble(std::ostream & stream,offs_t pc,const data_buffer & opcodes,const data_buffer & params)197 offs_t xavix2_disassembler::disassemble(std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer ¶ms)
198 {
199 m_pc = pc;
200 m_opcode = opcodes.r8(m_pc) << 24;
201 u8 nb = bpo[m_opcode >> 29];
202 for(u8 i=1; i != nb; i++)
203 m_opcode |= opcodes.r8(m_pc + i) << (24 - 8*i);
204
205 u32 flags = 0;
206 switch(m_opcode >> 24) {
207 case 0x00: case 0x01: util::stream_format(stream, "%s = %s + %s", r1(), r2(), val19s()); break;
208 case 0x02: case 0x03: util::stream_format(stream, "%s = %s", r1(), val22h()); break;
209 case 0x04: case 0x05: util::stream_format(stream, "%s = %s - %s", r1(), r2(), val19s()); break;
210 case 0x06: case 0x07: util::stream_format(stream, "%s = %s", r1(), val22s()); break;
211 case 0x08: util::stream_format(stream, "jmp %s", adr24()); break;
212 case 0x09: util::stream_format(stream, "jsr %s", adr24()); flags = STEP_OVER; break;
213 case 0x0a: case 0x0b: util::stream_format(stream, "%s = %s & %s", r1(), r2(), val19u()); break;
214 case 0x0c: case 0x0d: util::stream_format(stream, "%s = %s | %s", r1(), r2(), val19u()); break;
215 case 0x0e: case 0x0f: util::stream_format(stream, "%s = %s ^ %s", r1(), r2(), val19u()); break;
216
217 case 0x10: case 0x11: util::stream_format(stream, "%s = (%s%s).bs", r1(), r2(), off19s()); break;
218 case 0x12: case 0x13: util::stream_format(stream, "%s = (%s%s).bu", r1(), r2(), off19s()); break;
219 case 0x14: case 0x15: util::stream_format(stream, "%s = (%s%s).ws", r1(), r2(), off19s()); break;
220 case 0x16: case 0x17: util::stream_format(stream, "%s = (%s%s).wu", r1(), r2(), off19s()); break;
221 case 0x18: case 0x19: util::stream_format(stream, "%s = (%s%s).l", r1(), r2(), off19s()); break;
222 case 0x1a: case 0x1b: util::stream_format(stream, "(%s%s).b = %s", r2(), off19s(), r1()); break;
223 case 0x1c: case 0x1d: util::stream_format(stream, "(%s%s).w = %s", r2(), off19s(), r1()); break;
224 case 0x1e: case 0x1f: util::stream_format(stream, "(%s%s).l = %s", r2(), off19s(), r1()); break;
225
226 case 0x20: case 0x21: util::stream_format(stream, "%s = %s + %s", r1(), r2(), val11s()); break;
227 case 0x22: case 0x23: util::stream_format(stream, "%s = %s", r1(), val14h()); break;
228 case 0x24: case 0x25: util::stream_format(stream, "%s = %s - %s", r1(), r2(), val11s()); break;
229 case 0x26: case 0x27: util::stream_format(stream, "cmp %s, %s", r1(), val14s()); break;
230 case 0x28: util::stream_format(stream, "bra %s", rel16()); break;
231 case 0x29: util::stream_format(stream, "bsr %s", rel16()); flags = STEP_OVER; break;
232 case 0x2a: case 0x2b: util::stream_format(stream, "%s = %s & %s", r1(), r2(), val11u()); break;
233 case 0x2c: case 0x2d: util::stream_format(stream, "%s = %s | %s", r1(), r2(), val11u()); break;
234 case 0x2e: case 0x2f: util::stream_format(stream, "%s = %s ^ %s", r1(), r2(), val11u()); break;
235
236 case 0x30: case 0x31: util::stream_format(stream, "%s = (sp%s).bs", r1(), off14s()); break;
237 case 0x32: case 0x33: util::stream_format(stream, "%s = (sp%s).bu", r1(), off14s()); break;
238 case 0x34: case 0x35: util::stream_format(stream, "%s = (sp%s).ws", r1(), off14s()); break;
239 case 0x36: case 0x37: util::stream_format(stream, "%s = (sp%s).wu", r1(), off14s()); break;
240 case 0x38: case 0x39: util::stream_format(stream, "%s = (sp%s).l", r1(), off14s()); break;
241 case 0x3a: case 0x3b: util::stream_format(stream, "(sp%s).b = %s", off14s(), r1()); break;
242 case 0x3c: case 0x3d: util::stream_format(stream, "(sp%s).w = %s", off14s(), r1()); break;
243 case 0x3e: case 0x3f: util::stream_format(stream, "(sp%s).l = %s", off14s(), r1()); break;
244
245 case 0x40: case 0x41: util::stream_format(stream, "%s = (%s%s).bs", r1(), r2(), off11s()); break;
246 case 0x42: case 0x43: util::stream_format(stream, "%s = (%s%s).bu", r1(), r2(), off11s()); break;
247 case 0x44: case 0x45: util::stream_format(stream, "%s = (%s%s).ws", r1(), r2(), off11s()); break;
248 case 0x46: case 0x47: util::stream_format(stream, "%s = (%s%s).wu", r1(), r2(), off11s()); break;
249 case 0x48: case 0x49: util::stream_format(stream, "%s = (%s%s).l", r1(), r2(), off11s()); break;
250 case 0x4a: case 0x4b: util::stream_format(stream, "(%s%s).b = %s", r2(), off11s(), r1()); break;
251 case 0x4c: case 0x4d: util::stream_format(stream, "(%s%s).w = %s", r2(), off11s(), r1()); break;
252 case 0x4e: case 0x4f: util::stream_format(stream, "(%s%s).l = %s", r2(), off11s(), r1()); break;
253
254 case 0x50: case 0x51: util::stream_format(stream, "%s = %s.bs", r1(), val14sa()); break;
255 case 0x52: case 0x53: util::stream_format(stream, "%s = %s.bu", r1(), val14sa()); break;
256 case 0x54: case 0x55: util::stream_format(stream, "%s = %s.ws", r1(), val14sa()); break;
257 case 0x56: case 0x57: util::stream_format(stream, "%s = %s.wu", r1(), val14sa()); break;
258 case 0x58: case 0x59: util::stream_format(stream, "%s = %s.l", r1(), val14sa()); break;
259 case 0x5a: case 0x5b: util::stream_format(stream, "%s.b = %s", val14sa(), r1()); break;
260 case 0x5c: case 0x5d: util::stream_format(stream, "%s.w = %s", val14sa(), r1()); break;
261 case 0x5e: case 0x5f: util::stream_format(stream, "%s.l = %s", val14sa(), r1()); break;
262
263 case 0x60: case 0x61: util::stream_format(stream, "%s += %s", r1(), val6s()); break;
264 case 0x62: case 0x63: util::stream_format(stream, "%s = %s", r1(), val6s()); break;
265 case 0x64: case 0x65: util::stream_format(stream, "%s -= %s", r1(), val6s()); break;
266 case 0x66: case 0x67: util::stream_format(stream, "cmp %s, %s", r1(), val6s()); break;
267 // 68-69
268 case 0x6a: case 0x6b: util::stream_format(stream, "%s = %s >>s %s", r1(), r2(), val3u()); break;
269 case 0x6c: case 0x6d: util::stream_format(stream, "%s = %s >> %s", r1(), r2(), val3u()); break;
270 case 0x6e: case 0x6f: util::stream_format(stream, "%s = %s << %s", r1(), r2(), val3u()); break;
271
272 case 0x70: case 0x71: util::stream_format(stream, "%s = (sp%s).bs", r1(), off6s()); break;
273 case 0x72: case 0x73: util::stream_format(stream, "%s = (sp%s).bu", r1(), off6s()); break;
274 case 0x74: case 0x75: util::stream_format(stream, "%s = (sp%s).ws", r1(), off6s()); break;
275 case 0x76: case 0x77: util::stream_format(stream, "%s = (sp%s).wu", r1(), off6s()); break;
276 case 0x78: case 0x79: util::stream_format(stream, "%s = (sp%s).l", r1(), off6s()); break;
277 case 0x7a: case 0x7b: util::stream_format(stream, "(sp%s).b = %s", off6s(), r1()); break;
278 case 0x7c: case 0x7d: util::stream_format(stream, "(sp%s).w = %s", off6s(), r1()); break;
279 case 0x7e: case 0x7f: util::stream_format(stream, "(sp%s).l = %s", off6s(), r1()); break;
280
281 case 0x80: case 0x81: util::stream_format(stream, "%s = %s + %s", r1(), r2(), r3()); break;
282 // 82-83
283 case 0x84: case 0x85: util::stream_format(stream, "%s = %s - %s", r1(), r2(), r3()); break;
284 // 86-87
285 case 0x88: util::stream_format(stream, "jmp (%s)", r2()); break;
286 // 89
287 case 0x8a: case 0x8b: util::stream_format(stream, "%s = %s & %s", r1(), r2(), r3()); break;
288 case 0x8c: case 0x8d: util::stream_format(stream, "%s = %s | %s", r1(), r2(), r3()); break;
289 case 0x8e: case 0x8f: util::stream_format(stream, "%s = %s ^ %s", r1(), r2(), r3()); break;
290
291 case 0x90: case 0x91: util::stream_format(stream, "%s = (%s%s).bs", r1(), r2(), off3s()); break;
292 case 0x92: case 0x93: util::stream_format(stream, "%s = (%s%s).bu", r1(), r2(), off3s()); break;
293 case 0x94: case 0x95: util::stream_format(stream, "%s = (%s%s).ws", r1(), r2(), off3s()); break;
294 case 0x96: case 0x97: util::stream_format(stream, "%s = (%s%s).wu", r1(), r2(), off3s()); break;
295 case 0x98: case 0x99: util::stream_format(stream, "%s = (%s%s).l", r1(), r2(), off3s()); break;
296 case 0x9a: case 0x9b: util::stream_format(stream, "(%s%s).b = %s", r2(), off3s(), r1()); break;
297 case 0x9c: case 0x9d: util::stream_format(stream, "(%s%s).w = %s", r2(), off3s(), r1()); break;
298 case 0x9e: case 0x9f: util::stream_format(stream, "(%s%s).l = %s", r2(), off3s(), r1()); break;
299
300 case 0xa0: case 0xa1: util::stream_format(stream, "%s = ~%s", r1(), r2()); break;
301 case 0xa2: case 0xa3: util::stream_format(stream, "%s = %s", r1(), r2()); break;
302 case 0xa4: case 0xa5: util::stream_format(stream, "%s = -%s", r1(), r2()); break;
303 case 0xa6: case 0xa7: util::stream_format(stream, "cmp %s, %s", r1(), r2()); break;
304 case 0xa8: util::stream_format(stream, "jsr (%s)", r2()); flags = STEP_OVER; break;
305 // a9
306 case 0xaa: case 0xab: util::stream_format(stream, "%s = %s >>s %s", r1(), r2(), r3()); break;
307 case 0xac: case 0xad: util::stream_format(stream, "%s = %s >> %s", r1(), r2(), r3()); break;
308 case 0xae: case 0xaf: util::stream_format(stream, "%s = %s << %s", r1(), r2(), r3()); break;
309
310 case 0xb0: case 0xb1: util::stream_format(stream, "hreg[00] = %s *u %s", r1(), r2()); break;
311 case 0xb2: case 0xb3: util::stream_format(stream, "hreg[00] = %s *s %s", r1(), r2()); break;
312 case 0xb4: case 0xb5: util::stream_format(stream, "hreg[01:00] = %s *u %s", r1(), r2()); break;
313 case 0xb6: case 0xb7: util::stream_format(stream, "hreg[01:00] = %s *s %s", r1(), r2()); break;
314 case 0xbc: case 0xbd: util::stream_format(stream, "hreg[03], hreg[02] = %s /s %s", r1(), r2()); break;
315 case 0xbe: case 0xbf: util::stream_format(stream, "hreg[03], hreg[02] = %s /u %s", r1(), r2()); break;
316 // b6-c7
317
318 case 0xc8: case 0xc9: util::stream_format(stream, "%s = hreg[%s]", r1(), val6u()); break;
319 case 0xca: case 0xcb: util::stream_format(stream, "hreg[%s] = %s", val6u(), r1()); break;
320 // cc-cf
321
322 case 0xd0: util::stream_format(stream, "bvs %s", rel8()); break;
323 case 0xd1: util::stream_format(stream, "bltu %s", rel8()); break;
324 case 0xd2: util::stream_format(stream, "beq %s", rel8()); break;
325 case 0xd3: util::stream_format(stream, "bleu %s", rel8()); break;
326 case 0xd4: util::stream_format(stream, "bmi %s", rel8()); break;
327 case 0xd5: util::stream_format(stream, "bra %s", rel8()); break;
328 case 0xd6: util::stream_format(stream, "blts %s", rel8()); break;
329 case 0xd7: util::stream_format(stream, "bles %s", rel8()); break;
330 case 0xd8: util::stream_format(stream, "bvc %s", rel8()); break;
331 case 0xd9: util::stream_format(stream, "bgeu %s", rel8()); break;
332 case 0xda: util::stream_format(stream, "bne %s", rel8()); break;
333 case 0xdb: util::stream_format(stream, "bgtu %s", rel8()); break;
334 case 0xdc: util::stream_format(stream, "bpl %s", rel8()); break;
335 case 0xdd: util::stream_format(stream, "bnv %s", rel8()); break;
336 case 0xde: util::stream_format(stream, "bges %s", rel8()); break;
337 case 0xdf: util::stream_format(stream, "bgts %s", rel8()); break;
338
339 case 0xe0: util::stream_format(stream, "jmp lr"); flags = STEP_OUT; break;
340 case 0xe1: util::stream_format(stream, "rti1"); flags = STEP_OUT; break;
341 case 0xe2: util::stream_format(stream, "rti2"); flags = STEP_OUT; break;
342 case 0xe3: util::stream_format(stream, "rti3"); flags = STEP_OUT; break;
343 // e4-ef
344
345 case 0xf0: util::stream_format(stream, "stc"); break;
346 case 0xf1: util::stream_format(stream, "clc"); break;
347 case 0xf2: util::stream_format(stream, "stz"); break;
348 case 0xf3: util::stream_format(stream, "clz"); break;
349 case 0xf4: util::stream_format(stream, "stn"); break;
350 case 0xf5: util::stream_format(stream, "cln"); break;
351 case 0xf6: util::stream_format(stream, "stv"); break;
352 case 0xf7: util::stream_format(stream, "clv"); break;
353 case 0xf8: util::stream_format(stream, "di"); break;
354 case 0xf9: util::stream_format(stream, "ei"); break;
355 // fa-fb
356 case 0xfc: util::stream_format(stream, "nop"); break;
357 // fd
358 case 0xfe: util::stream_format(stream, "wait"); break;
359 // ff
360 default: util::stream_format(stream, "?%02x", m_opcode >> 24);
361 }
362
363 return nb | flags | SUPPORTED;
364 }
365